a Receptor expression in prefrontal cortex and striatum normalized to RLA-I. Both in prefrontal and striatum, mGluR2 levels are significantly lower in RHA-I when compared to RLA-I. For the 5-HT2A receptor only in the striatum, the RHA-I strain presented lower expression levels of this receptor. No difference was obtained for the 5-HT1A receptor. b When comparing the relative expression of 5-HT2A versus mGluR2, there was a significant difference in prefrontal cortex of the RHA-I strain that was diminished in the striatum as a result of the lower expression of 5-HT2A receptor of this strain in this region. Two-way ANOVA, *p < 0.05, **p < 0.01, ***p < 0.001